Completely disagree! This was one of the first things that was apparent to me. She was definitely lip-syncing when she started (on top of the stadium) and through her stage routine. The vocals were far too clean and refined to be live. Plus, you'd be able to hear the fluctuations in her voice while physically exerting herself while spinning upside down on those cables.From all analysis, it appears she was doing all the singing without lip-syncing
There were moments when she was playing the piano that I thought she may actually be singing though.